Clamp



FIG. 1 is a front elevational view of the design;

FIG. 2 is a top plan view showing the design;

FIG. 3 is a left side elevational view of the design;

FIG. 4 is a right side elevational view of the design;

FIG. 5 is a back elevational view of the design;

FIG. 6 is a bottom plan view of the design; and,

FIG. 7 is a front, top and left side perspective view of the design. 

The ornamental design for clamp, as shown and described. 